Air-propeller.



H. OTTO.

AIR PROPELLER.

APPLICATION IIL'EID NOV.14, 190a.

Patented Sept. 7, 1909.

Win 5555;

, with water, that, with the some speed of the resistance to the movement/of the bladesas "blades except in one direction, and, by comwhere the greatest air resistance 18 en HENRY OTTO, 0F BLOOMING'ION, ILLINOIS.

AIIt- PROP ELLER.

touted Hopi. '7, I909. Serial No. 462,582].

uiunur-r. .\s ;l|'|\\ howrvvr, said hub is provided with inlogi'ul attaching plulcs a zen oi the United States, and residing at lo which wuiil plnli-s urn rigidly riveted or lllU0ll'ilH} fiUll, in [he county of McLcun and i Shite of Illinois, huninn-uteri u how and l useful llllPlflVLlllUlll' in Ai1---Propellers, of! which the following l-;' a complete speoilinir tion.

This invention relates to i1nprovemcnts in procllers rind more particularly to a pro pol er mlu 'itml for uvnul nuvi 'ution.

Ileretofore it has been usiuil to construct propellers for aerial nuvigulion along the some lines as those. constructed for water] navigation, but it has been found that, owin to the greater elasticity and mobility, and one density, of the air, as compared pro eller in air as in water, but it compare-- two y small amount of force can be exerted.

which air passes off .from the pro eller blades in all directions as they are or inarily con structed. i

The object of this invention is to provide a propeller adapted for aerial navigation which is so constructed that it tends to pre vent the air from escaping off from the pressing the air causing it to exert greater itescapes from the rear margins thereof with increased velocity.

' It is a further objeet.of the invention to provide a propeller in which the blndes are strengthened or reinforced at the (nuts countered 'so .as to prevent their becomin distorted, andut the same time making. Itpossible to construct the blades of comparetively light material.

"The invention consists of the matters hereinafter described in the s ecification and more fully pointed out on defined .in the up ended claims.

n the drawings.- Figure 1 is -a rear elevation of i propeller embodying my invention. Fig. 2 is a front elevation of the same. Fig. 3 is an end elevation of the propeller. Fig. 4 is a side elevation of the same. Fig. 5 1s a section taken on line 5--5 of Fig. 2. Fig. 6 is c section taken on line 6-6 of Fi 3.

As shown in said drawings: A im icute's a propeller shuft having a hub a rigidly secured thereon, and to which the pro eller blades lt-B are. secured in any pre erred detai holioil. Huh! lllillll'rl iuuy he of any {ire lm'i'ml uumhi-r, hut, as hon-in shmvh, but two urtoiuplovml \vhirh urn op msilolv dismu-(l on the .-;huli. 'lhi. hirwnr or air tul our wh t I: of will hhidr-s extend oppositely from llushaft end at approximately right Hugh's thorn-lo. while the mil-edges Ii. therrol' extend i'curn'urilly ollhc shaft and are filrm'lt'l' ihuu 1hr edges (2. The blades are run-mired on their rmir hide and the general iano. tin-roof lies ul uu uuglc of 11,)Til'OXlmainly (le o s in tin: shaft with the groan-st vurvzil'ure or c nvexity thereof near lHIil'. a shown more learly in Figs. 3 viii. i

(in theoutvi' end of each blade and on the rear side thereof is i1 retaining flange b which increnscs in width from the'forwurd cdge'of the blade toward therear thereof. Owing to the fact that the edge 5' is shor'ter than the edge 2 of the blade it is obvious that the rear end of said flange isnearer the shaft than is the forward end thereof, with the result that when air enters the blade it is caught by said flange and forced or-compressed toward the shaft in its effortt-o escape from the end of the blade,'

thereby causing the air to leave the blade iromihc rear edge'b with increased veloc ity, and as. consequence to exert greater forward pressure on thcblaide. The ed es ofthe blades, as well as the edges'of tie flanges, are reinforced by u strip of metal 6' hnvm sufficient rigidity to prevent the blade from ending under the strain to which it is subjected.

Obviously a propeller embodying my invention is adapted. to exert greet 'force upon: the air by reason of the concen etion ofth air 11 on the blades, and obvious y also many is of form and construction may be varied without departing from the principlea of my inventionl I claim as my invention: 1. In it device of the class described the combination with a ropeller blade. of a. rcurwurdly and inward the rear face thereof, said flan e increasing in width from its forward (:11 renrwardly. 2. In a deviceof the class described the mnnhinulion with u shuft of propeller blades thereon said blades l ving couru-vud on their rc-ur'si 1e, and a hinge on the rear face of ly directed flange on each blade extending from the front edge thereof rearwardly and toward Hilltl Shaft and increasing in width toward its rear end.

3. In a device of tho class described the combination with a shaft of conouvod propeller blades Lhrruon. and u. flange on the concave side of each blade adapted to compress the air and direct it to the roar edge of the blade said [hinge increasing in width from its front (and rearwardly.

4; In a device of the class described the combination with u shaftof pro m ller-blades thereon, a forwardly tapering fringe on the outer and of mush blade extending from the front vdgo thereof ruurwurdly and uppronching nearer to the shaft at. its rear and than at its forward end, and n roinforcing strip on tho mtg-( s of said blades and flanges.

In witness whereof I have hereunto subscribed my lmmo in the presence of two wit moses.

HENRY 0'1"]0. W llJ'lESSOH li-r'rnn MAn'rlcNsEN, Loom W. lumen. 

